Vent on a near perfect roof [RE-wrenches]

[Peter Duchon]

Jim,
You are correct, it's typically not an issue.  If you have attic access
reasonable, you can even (in most jurisdictions) reroute the vent pipe to
another area, otherwise, just cut if off top-side of roof, with at least an
inch below the module backing (not necessarily below the frame).  We do this
all the time without issue.   Snow shed or cover also (typically) would not
be an issue with the array covering the open vent.

Always wise to check with inspectors in the area however.   They might think
you are trying to hide something otherwise and that may cause further
investigation and needless waste of time.

PD
asappower.com
1auinc.com

-----Original Message-----
From: Dana Orzel [mailto:dana at solarwork.com]
Sent: Thursday, June 01, 2006 10:31 AM
To: RE-wrenches at topica.com
Subject: Vent on a near perfect roof [RE-wrenches]




If it is a sewer-septic waste vent it serves as a vacuum breaker, [remember
the finger over the end of the straw full of water, lift the finger and the
water flows out] not really a vent. Cutting it shorter should cause no
problems if this is what it is. How ever, local codes may not allow this.
Check with a trusted local plumber for height clarifications and then make
your decision. Usually snow is the only real consideration.
If there is an issue could you cut it really close, install a 90 deg. and
run it up to a higher point and then angle it up?

Dana Orzel
Great Solar Works, Inc.
"Responsible Systems For Responsible People"
dana at solarwork.com
970.626.5253 - H/O
970.209.4076 - C
970.626.4140 - F
-----Original Message-----
From: Jim Duncan [mailto:ntrei at earthlink.net]
Sent: Thursday, June 01, 2006 10:01 AM
To: RE-wrenches at topica.com
Subject: [RE-wrenches]


I recently found the near-perfect roof. True south at 30 deg pitch and
no shadows for a block in every direction. The angle of the ridges makes
a perfect fit for 7100 Watts of Sharp 142s and the 72W triangle modules.
I confirmed the fit, to scale, with an Autocad solid model so I'm
positive that the space needed is there.
The only problem is an open 2-inch dia drain vent stack that will be
about a foot inside the edge of the array. My first thought is that,
since it is only an air vent, there is no harm in cutting it short
enough to just clear the underside of the module. An inch clearance
seems adequate. There should never be any liquid ejected 12 feet up and
only a gentle rush of air down the pipe to break the vacuum.
I know this problem must have been addressed in the field many times, so
what is the consensus on cutting the stack down to about 4-5 inches
tall? I found no postings addressing this specific topic, which kind of
surprised me. Must not be a big problem then. Yes?
Thanks
Jim Duncan
North Texas Renewable Energy Inc
Fort Worth, Texas

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